"In saying this, I still do stand by my comment regarding the fact that it is equally crazy to even contemplate that a western secular constitution may have room for sharia law."
You are way behind the times, as the Archbishop of Canterbury said in 2008 that "adoption of some elements of sharia law is unavoidable" in the UK. http://news.bbc.co.uk/2/hi/uk_news/7232661.stm
And that is in a country with only 6% muslim population, what will the pressures be like @10 or 15%.